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1.
本文考虑了带有位势的散度形式的 Grushin 型退化椭圆算子的 Dirichlet 加权特征值的估计.利 用傅里叶变换的方法得到了特征值的精确下界估计.然后通过试验函数的方法得到了特征值上界的杨型 不等式.  相似文献   

2.
林勇  满守东 《数学学报》2015,58(6):953-964
对于图G上热方程(△-/t-q)u=0的正解u=u(x,t),得到图上改进的Li-Yau梯度估计不等式,这里q满足Γ(q)≤η~2,η是一个常数,进而得到改进的Harnack型不等式,推广了以前的结果.  相似文献   

3.
本文证明了 Ladyzhens kaja 和 Ural′ceva 的类非负函数满足 Trudinger 型的弱Harnack 不等式;并由此证明了 Weiser 的一个猜测:抛物 Q-minima 满足 Harnack 不等式.  相似文献   

4.
本文讨论由未知函数 u=0引起的下列退化变分问题正解的存在性:证明此正解满足 Harnack 不等式性质,进一步讨论带自然增长退化椭圆型 Euler 方程具下列非齐次 Dirichlet 问题解的存在性:  相似文献   

5.
研究了Heisenberg群上的Folland-Stein算子和Kohn Laplace算子的二次多项式算子的Dirichlet特征值问题,建立了低阶特征值的一些不等式.  相似文献   

6.
张金国  刘晓春 《数学杂志》2012,32(4):571-581
本文研究了一类Dirichlet边界的椭圆型半变分不等式问题.利用非光滑形式的环绕定理和非光滑形式的对称山路定理,得到了在相应假设条件下此不等式问题至少有一个非平凡解和无穷多解.本文中非光滑势能在原点处关于算子+V(x)的第一正特征值λ是不完全共振的.  相似文献   

7.
讨论了多项式Laplace算子Dirichlet问题,首先通过选取适当的函数,根据RayLeigh-Ritz不等式,得到了该问题用前k个特征值来估计第k+1个特征值的不等式,然后通过选取适当的系数,发现不等式蕴含成庆明和杨洪苍的结论及吴发恩和曹林芬的结论,且根据Chebyshev不等式等,证明了该不等式优于陈祖墀和钱春林的结论.  相似文献   

8.
用代数方法给出了一个关于连通图顶点度数的不等式,并给出了连通图拟拉普拉斯矩阵的最大特征值的几个上界.  相似文献   

9.
本文研究了具有加权测度dμ=e~(-φ)dv的H型群G上漂移Laplace算子-?_G+▽_Gφ,▽_G(·)的Dirichlet特征值问题,建立了该问题的Levitin-Parnovski型特征值不等式,推广包含了Ilias和Makhoul对Heisenberg群上次Laplace算子所获得的结果 (J. Geom. Anal.,2012, 22(1):206–222).  相似文献   

10.
本文研究了Carnot群上水平Laplace算子的二次多项式算子的Dirichlet特征值问题,并建立了一些特征值不等式.特别地,我们的结果涵盖了文献[10]对双调和水平Laplace算子所获得的结果.  相似文献   

11.
Biroli  Marco 《Potential Analysis》2001,15(1-2):1-16
We study at first the solutions of a Schrödinger type problem relative to the subelliptic p-Laplacian: we prove, for potentials that are in the Kato space, an Harnack inequality on enough small intrinsic balls; the continuity of the solutions to the homogeneous Dirichlet problem follows from some estimates in the proof of the Harnack inequality. In the second part of the paper we study a relaxed Dirichlet problem for the subelliptic p-Laplacian and we prove a Wiener type criterion for the regularity of a point (with respect to our problem).  相似文献   

12.
We prove a Harnack inequality for positive harmonic functions on graphs which is similar to a classical result of Yau on Riemannian manifolds. Also, we prove a mean value inequality of nonnegative subharmonic functions on graphs.  相似文献   

13.
We establish a Harnack inequality for finite connected graphs with non-negative Ricci curvature. As a consequence, we derive an eigenvalue lower bound, extending previous results for Ricci flat graphs.  相似文献   

14.
A well known theorem of Delmotte is that Gaussian bounds, parabolic Harnack inequality, and the combination of volume doubling and Poincaré inequality are equivalent for graphs. In this paper we consider graphs for which these conditions hold, but only for sufficiently large balls, and prove a similar equivalence.  相似文献   

15.
A Saint-Venant type principle for Dirichlet forms on discontinuous media   总被引:6,自引:0,他引:6  
We consider certain families of Dirichlet forms of diffusion type that describe the variational behaviour of possibly highly nonhomogeneous and nonisotropic bodies and we prove a structural Harnack inequality and Saint Venant type energy decays for their local solution. Estimates for the Green functions are also considered.
Sunto Si considerano certe famiglie di forme di Dirichlet di tipo diffusione che descrivono il comportamento di corpi fortemente non omogenei e non isotropi e si provano per le relative soluzione locali una diseguaglianza di Harnack strutturale e stime tipo Saint Venant della decrescita dell'energia. Si studiano inoltre stime per la funzione di Green.
  相似文献   

16.
We present graphs that satisfy the uniform elliptic Harnack inequality, for harmonic functions, but not the stronger parabolic one, for solutions of the discrete heat equation. It is known that the parabolic Harnack inequality is equivalent to the conjunction of a volume regularity and a L 2 Poincaré inequality. The first example of graph satisfying the elliptic but not the parabolic Harnack inequality is due to M. Barlow and R. Bass. It satisfies the volume regularity and not the Poincaré inequality. We construct another example that does not satisfy the volume regularity.  相似文献   

17.
An inequality for superharmonic functions on Riemannian manifolds due to S.Y. Cheng and S-T. Yau is adapted to the setting of graphs. A number of corollaries are discussed, including a Harnack inequality for graphs having at most quadratic growth and satisfying a certain connectedness condition.  相似文献   

18.
Some Remarks on the Elliptic Harnack Inequality   总被引:2,自引:0,他引:2  
Three short results are given concerning the elliptic Harnackinequality, in the context of random walks on graphs. The firstis that the elliptic Harnack inequality implies polynomial growthof the number of points in balls, and the second that the ellipticHarnack inequality is equivalent to an annulus-type Harnackinequality for Green's functions. The third result uses thelamplighter group to give a counter-example concerning the relationof coupling with the elliptic Harnack inequality. 2000 MathematicsSubject Classification 31B05 (primary), 60J35, 31C25 (secondary).  相似文献   

19.
We show that the -parabolic Harnack inequality for random walks on graphs is equivalent, on one hand, to the sub-Gaussian estimate for the transition probability and, on the other hand, to the conjunction of the elliptic Harnack inequality, the doubling volume property, and the fact that the mean exit time in any ball of radius R is of the order . The latter condition can be replaced by a certain estimate of the resistance of annuli. Received: 15 November 2001 / Revised version: 21 February 2002 / Published online: 6 August 2002  相似文献   

20.
We provide a new formulation of Harnack?s inequality for nonlocal operators. In contrast to previous versions we do not assume harmonic functions to have a sign. The version of Harnack?s inequality given here generalizes Harnack?s classical result from 1887 to nonlocal situations. As a consequence we derive Hölder regularity estimates by an extension of Moser?s method. The inequality that we propose is equivalent to Harnack?s original formulation but seems to be new even for the Laplace operator.  相似文献   

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